You can define multiple key which you want to send, no size limitation.

You can use regex both key-pattern and key-replacement.

key-pattern (simply called pattern) is a key that is matched against fluentd's JSON key.

key-replacement (simple called replacement) is a key that is send to Zabbix Server if pattern matches fluentd's JSON key. Before sending to Zabbix Server, fluentd's JSON key is converted to Zabbix key according to the replacement.

How to Install

execute command gem install:

$ sudogeminstallfluent-plugin-zabbix-simple

td-agent has its own Ruby ecosystem.
If you have installed td-agent, you would use gem command included with td-agent.